There's nothing to configure on the tftp server, unless you want to turn
the hashing off, just install it and run it, then from the device you want
to back up run the backup command while in the enable mode.

for running config:

write network and it will prompt you for the tftp server ip address, and the
file name.

for the startup config you'll have to use copy startup tftp and follow the
prompts I believe.

TFTP servers are software programs that run on a pc. Any PC. From my
experience, there is little or no setup in an tftp server software. You just
low the software onto the machine. Then start the software.

Obtain the ip address of the machine with "IPCONFIG". Then go to the router
and issue the copy command "COPY RUNNING-CONFIG TFTP"
router ask for the address. you reply with the ip address of the pc that
you discovered with the IPCONFIG" command.

ur gettingthis error becoz ur tftp server is not
running.start the tftp server and then go to router
prompt give the command copy r tftp .
also see that in tftp configuration that it is enable
for both rx/tx . and not only receiv or only transmit
it should be enable for both .try to download desktop
tftp server from net it works fine .also check the
default path in tftp server.

Is see by the information that you provided that the router can reach the
NIC of the PC.

May I suggest that you do the following on the PC.
1) Ping the router (this will work)
2) Ensure the TFTP software has been started and is running.
3) from the pc, attempt to send a file to the tftp server.
(go the dos prompt, enter the following command "TFTP 10.37.3.3 put a.bat
a.bat" where a.bat is the name of a real file. or it could be joe.doc...
4) review the TFTP log and see if this file has been received by the tftp
software.

I prefer the 3Com TFTP server program. Once you start the program, map the
TFTP tab to the folder where you want to dump the files on your client
machine. Make sure your client pc is on the same network as the Cisco
device by pinging from the client to the device and pinging from the device
back to the pc. If the ping process works you should be able to copy the
files to the pc or upload from the pc. Make the when asked for the IP
address you use the IP address of the pc(Server location). Also if you want
to back up a copy of the flash make sure the file name is correct. It is
critical on that, case sensitive and all.

Additional info for you. I can backup all of my equipment from one pc
across several routers (not using Console port) while they are in
production, except the large switches with a CatOS. Most do not have an IP
address on my WAN network, but a separate management IP and separate vlans.
KEY here is to first telnet into the nearest router to your PC. That router
knows the routes to the equipment and back. Once your telnet session is
established on the router, telnet to the piece of equipment you want files
from. Turn on your TFTP server and do your copying. Good idea to have copies
of the flash just incase the flash becomes corrupt.